Most foreign substances in inspired air fail to reach the lungs because of the
A) porous structure of the nasal conchae.
B) ciliated epithelium and mucus that line the respiratory passages.
C) abundant blood supply to the nasal mucosa.
D) action of the epiglottis.

Question

Quizplus · Accepted Answer

The ciliated epithelium and mucus in the respiratory passages trap and move foreign particles away from the lungs, preventing them from reaching the lower respiratory tract.

Most Foreign Substances in Inspired Air Fail to Reach the Lungs